Abrading machine



June 8 A926.

Q5. T. EN

ABRDING MACHINE Filed oct. 15, 1926 4 Sheets-Shea?. l

June 8 1926. 1,587,947

J. T. GRIFFIN ET AL.

ABHADING MACHINE Filed Ooi. 15, 1920 4 Sheets-Sheet 2 une s ma. 1,587,941

J. T. GRIFFIN Erm.

ABRADING MACHINE Filed oct. 15, 1920 4 shets-sheet s Jane S ,926 1,587,947

J. T. GRIFFIN ET AL.

ABRADING MACHINE Filed not. 15, 1920 4 Sheets-Sheet 4 tlhll'tll JAMES T. GRIFFIN, OF OAK PARK, AND CARLA. NELSON, GIE' CEICAGO, ILLINIS, AS-

SIGNORS TO WESTERN EJECTREC' CGMPANY, NORPORATED, 0F NEW YRK, N. Y.,

A CORPORATION 0F NEVI YORK.

ABBADING MACHIN E.

Application filed October 15, 1920. Serial No. 417,217.

This invention relates to abrading machines, and more particularly 'to an apparatus which is designed to remove the glaze from carbon disks used in granular transmitters7 the removal of which results in giving the carbon button a surface which is better adapted to receive a copper platingl to which they are subsequent-ly treated.

The object of this invention is to provide a mechanism by means of which the operation of removing the glaze from carbon buttons may be rapidl-y and eiiicientlyperformed with a minimum of manual operationJ thereby eliminating a ditlicult andr objectionable hand rubbing operation and reducing to a minimum the loss in the number of buttons chipped or broken.

In connection with this mechanism there is provided a holder for the buttons While being operated upon which prevents breakingand. chipping of the buttons during` the operation` and which can be rapidly and efticiently loaded and positioned on the mechanism during its operation.

In its preferred form the mechanism of this invention consists in Kgeneral of a sandblasting mechanism including a reciprocating table adapted to receive especially designed holders for the buttons. Indexing mechanism is provided for moving the table around under the sand-blasting nozzle. The

holders are each provided with a number of radial rows of openings which receive the buttons.

In the drawings:

Fig. 1 is al partial front elevation of the apparatus with the cabinet enclosing it shown in section;

Fig; 2 is a partial plan section thereof reciprocal and intermittently revolvable table shown partly loaded with holders;

Fig. 7 is a section on the line 7--7 thereof, and

Fig. 8 is an enlarged detail. section through one opening in the holder with. a button held therein. Y

As shown in the drawings, 1.0 represents a bench or table provided with legs 11-11 for supporting the apparatus. Within a main enclosing cabinet 12 isa circular table 13 which is revolvably supported upon .a shaft 14 secured to a reciprocal carrier 1F. The carrier 15 rides between rollers 18-18 which are suitably secured to a frame 19 which in turn is secured to the cabinet 12. One portion of the carrier 15 is channel shaped in cross-section, as best shown inL Fie'. l at 20,.vvhich section provides a suitablze surface for securing the sha-ft la thereto and` makes the travel thereof While riding.;` between the rollers 18 18 steadier. The other portion of. the carrier 1.5 designated at 21 is circular in cross-section and is provided near` its end with a slot 22.

The mechanism for reciprecati-ng the ta.- ble 12 will new be described.

Supported upon a shelf- 23 secured between the leg-s. 1'1-11 and. to one side of the main cabinet 12 is a motor 25 which drives a Worm gear 26 through a Worin 27 secured upon: its shaft. The Worm gear 26 turns a suitable heart-shaped cam 28 which operates a cam rod 29 equipped With al roller 30 riding on the face of the cam 28. The rod 29 is pivoted at 31 to a bracket 32 secu-red to theunder side of the table 1-0 with its upper'end protruding' through a slot 3l there- 1n and is equipped with a roller 35 Whichrides in the slot 22 in the carrier 15. The

slotted end ofthe carrier 15 is reduced and enters a compression spring- 36 which is l'ocated-Within a case 37 secured to the cabinet 12. rlhe spring 36 functions to return the parts to their'normal position after a movement, as `shown by the full line `position thereof in Fig. l. The case 37 is suitably slotted alongl its lower surface to provide for the movement of the cam rod 29;

Cia

The mechanism for indexing the table 13 carrying button holders 39--39 a distance from one row of buttons held therein to the neXt row at the end oi' a complete reciprocation ot' the table 13 consists ot a ratchet wheel L secured to the under side oi' the table 13 which is engaged by a pawl 41 pivoted to a stationary support 42 and held in engagement with the teeth on the ratchet wheel l0 by a leaf spring (See Fig.

The operation of the table reciprocating and indexing mechanism is as follows:

As the cam 23 is revolved, the cam rod 29 is rocked. about its pivot 31 by the engagement of the roller 36 thereon with the tace of the cam 23. The engagement of the roller on the upper end of the cani rod 29 in the slot oi' the carrier 15 causes the table 13 to be moved to the right, or to the dotted line position, as best shown in Fig. 3 and against the action of the spring 36. During this movement of the table 13 the row of buttons which are directly under the sand blast nozzle are given a blast and during the return movement they are also blasted. Near the end of the return movement the pawl al, which has been moved inward about its pivot during the iirst part of the movement oi' the table by the spring 43 as the tooth which was engaged thereby was moved away, is moved inward against a stop la which brings the pawl in line to engage the neXt tooth on the ratchet in a conntercloclrwise direction. As the table nears the end of its complete movement or back to its normal position, as shown in Fig. 3, the pawl 41 engages a tooth in the ratchet, and as the table is still moving it is revolved to bring the next row oi buttons under the sand b-last nozzle in the' direction indicated by the arrow in Fig. 3. ln operation the cam 28 is continuously revolving so that the table is being continuously reciprocated bac-l; and forth and indexed to the next row of buttons receiving two blasts from the sand blast nozzle during a complete reciprocation.

The holders 39-39 are designed so that they may be readily loaded and placed in line on the table 13 or taken therefrom during the movements of the carrier, also the carbon ybuttons are held therein in suc-h a manner that they are fully protected from, being broken or chipped at their edges by being held in the holders, or by the sand blast. Fach holder 39 consists of an arc shaped plate 46, the peripheral edge of which is of the same curve as the circumferential edge of the table 13 and is provided with tour radial rows of openings for the reception 'of the buttons. The walls ot the openings 50 are tapered (see Fig. 8) and are a trifle smaller than the size of the button at one side of the plate. `When the button is in place, the edge of the side thereof which faces the sand blast is fully protected from being' chipped thereby by that portion ot the tapered wall which overhangs the edge of the button, as clearly shown in Fig. 8. The holders are preferably loaded by scooping the plate L16 upside down into a supply of buttons and shaking it until the openings 5() are all loaded. A support 51 equipped with a sponge rubber backing 52 which is of the same shape as the plate 46 is laid against the buttons in the openings therein and clamped thereto by turning thumb nuts 53 onto threaded pins 511 secured to the plate 46. The sponge rubber backing prevents the breaking ot' the buttons when the support 51 is clamped to the plate 46. The table 13 is provided with a depressed surft'ace 55 provided with circular depressions i 56 therein for the reception of the thumb nuts 53. The thumb nuts 53 entering the depressions serve to retain the holders in position on the table 13 when it is being operated and also serve as locating means for the operator in placing the loaded holders in position on the table during its operation.

The air Siphon system for drawing the sand combined with the air agitator at the sand supply consists of an air supplyv line 58 of a suitable size and'provided with a suitable air pressure which is connected with both air siphon nozzle 59 and air agitator nozzle 60. A main valve 61 is provided for controlling both nozzles and an auxiliary valve 62 is placed in the line to the nozzle 59 so that the air thereto can be controlled independently of the air to the agitator nozzle 60. The nozzle 59, as clearly shown in Fig. 5, is of a suitable diameter and is secured within a iiXture 63 Cil which is adapted to be connected with the` air line 58 and a line 64E to a sand supply fixture 65. A sand blast nozzle 66 is threaded onto a reduced end of the iiXture 63 with the air nozzle 59 extending a short distance into the sand blast nozzle 66 to give the correct siphoning effect. The end of the sand blast nozzle 66 is surrounded by a suitable baille 67 which is secured to the cabinet 12, as shown in Figs. 1 and 2,-and is preferably made oi sheet metal lined with rubber, the rubber being fringed as shown at its lower edge. A sand chute 69 is positioned under the reciprocating table 13 and the cabinet 12, being secured to the table 16. The sand after being blasted from the sand blast nozzle 66 falls down the chute 69 into the sand supply fixture 65.

The air agitator nozzle which is connected with the air line 5S is suitably positioned within the liiiture with its upper end preferably located a suitable distance below the sand level indicated by brolren line 72. The nozzle 60 is set in the fixture fil) at the same angle as the sand line 64 and .in line with its center, thereby facilitatingthe siphoning of the sand by the air nozzle 59, and' also tending to keep the sand in a loose condition suitable for use. The operator will throw into the chute 69 sufficient sand whenever it falls below the proper level. This is done by using suitable hand hole openings provided in the front wall of the cabinet l2 (not shown in the drawings) which are used by the operator to load and unload the table '13 with the holders 39-39- A screen 73 is secured in the chute G9 so as to insure against large particles getting into the sand supply lixture G5.

An exhaust duct 74 is located at the top of the cabinet 12 and near the back for drawing off dust, etc., which is created during sand blasting.

lllhat is claimed is:

l. ln a sand blasting apparatus, a work carrier for holding an article to be sand blasted, means for directing a sand blasting medium on the article when in a predetermined position, means for rotating said carrier to bring said article into said predetermined position, and means for effecting relative radial movement between said carrier and said first recited means while said article is in said position and during ils .subjection to said sand blasting medium.

2. ln a sand blasting apparat-us, a` Work carrier for holding a plurality of articles to be sand blasted, mechanism for directing a sand blast-ing medium on an article when in a predetermined position, means for rotating said carrier to successively bring said articles into said predetermined position, and means effective for reciprocating said carrier contemporaneously with the subjection of said article to said sand blasting medium.

ln a sand blasting apparatus, a work carrier for holding an article to be sand blasted, means for directing a sand blasting medium on the article when in a predetermined position, means for intermittently rotating said carrier for bringing said article into said predetermined position, and means for effecting relative radial movement between said carrier and said first recited means while said article is in said position and during its subjection to said sand blasting medium.

4. In a machine for removing glaze from the surface of carbon buttons, a plurality of work holders each adapted to hold a number of rows of buttons, an intermittently rotatable and reciprocal carrier adapted to be loaded and unloaded and to retain said work holders thereon during movements thereof, and means for abrading the sur` faces of one row of carbon buttons during each reciprocation of said carrier.

5. In a machine for removing glaze from the surface of carbon buttons, a` plurality of worl holders each adapted to hold a number of radially disposed rows of buttons, an intermittently rotatable and reciprocal carrier adapted to be loaded and unloaded and to retain said work holders thereon |during movements thereof to cause each row of buttons to be treated twice with an abrading means before said carrier is revolved for the treatment of the next row of buttons, and means for-abrading the surfaces of one row vof carbon buttons during each reciprocation of said carrier.

G. ln a machine for removing glaze from 'the surface of carbon buttons, a plurality of worl; holders each adapted to hold a number of rows of buttons and equipped with positioning and retaining means on their lower surfaces, an intermittently rotatable and reciprocal carrier provided with depressions on its upper surface for the reception of the positioning and retaining means on said work holders whereby said holders are adapted to be put on, taken oli' and retained on said carrier during movements thereof, and means for abrading the surfaces of one row of carbon buttons during each reciprocation of said carrier.

7. ln an abrading apparatus, the combination with a work support and an abrading means, of a worlr holder comprising a plate provided with a lurality of openings adapted to receive t e article-s to be abraded and position them therein, said openings having a shape which will expose the entire top surface of the articles to the abrading means and protect the edges thereof from being chipped by said abrading means, and retaining means for holding the articles within the openings in said plate.

8. In an apparatus for removing glaze from the surface of carbon buttons, the combination with a work support and an abrading means, of a work holder comprising a plate provided with a plurality of openings with tapered walls adapted to receive the buttons and position them therein whereby the entire top surface is exposed to the abrading means with the edge thereof protected from being chipped by the overhanging tapered wall of the opening', and retaining means for holding the but-tons within the openings in said plate adapted to be secured thereto.

9. ln an abrading machine, a plurality of work holders each adapted to hold a number of rows of articles to be abraded, a carrier adapted to detachably hold said work holders, means for intermittently rotating and reciprocating said carrier, and means for abrading the surface of one row of said articles during each reciprocation of said carrier.

10. In an abrading machine, a plurality of Work holders each adapted to hold a numrality of times during each reeiprooation of her of radially disposed rows of articles to said Carrier.

be abruded, a carrier adapted to detachably In witness whereof, We hereunto sub- 10 hold said Work holders, means for interscribe our names this 21 day of September L mittently rolating and reciprocating said A. D., 1920.

Work carrier7 and means 'for abrading the JAMES T. GRIFFIN. surf-.ice or' one row of said articles a plu- CARL A. NELSON. 

